function kaoshi(){
    document.getElementsByClassName('kuangqilai1').style.diaplay='none';
    document.getElementsByClassName('kuangqilai2').style.display='block';
}

function gongshi(){
    document.getElementsByClassName('kuangqilai2').style.diaplay='none';
    document.getElementsByClassName('kuangqilai1').style.display='block';
}



// function kaoshi(){
//     document.getElementsByClassName('kuanqilai1').className='kuangqilai2';
//     document.getElementsByClassName('kuanqilai2').className='kuangqilai1';
// }